Stop means for shafts of recorders and the like



June 10, 1941. G. J. GRIZEY 2,245,032

STOP MEANS FOR SHAFTS 0F RECORDERS AND THE LIKE Filed Aug. 2, 1940 ZJ 650205 JGR/ZEY Patented June 10, 1941 UNITED STTES PAT STOP MEANS FOR SHAFTS OF RECORDERS AND THE LIKE George J. Grizey, Canton, Conn, assignor to Veeder-Root Incorporated, Hartford, Conn., a corporation of Connecticut Application August 2, 1940, Serial No. 349,527

Claims.

This invention relates to recording or registering mechanism and has particular reference to means for releasably stopping the rotation of a shaft of such a mechanism in a given position in the cycle of operation. As an instance of a use to which the improvements of the present invention may be applied, reference may be had to the recording mechanism shown in the patent to McMullen No. 2,086,363 dated July 6, 1937, and wherein is shown an operating shaft which performs several functions upon a cycle of two rotations thereof. In the operation of that mechanism, it is desirable to stop the rotation of the operating shaft at the end of each rotation thereof. It is, of course, understood that my improved invention has other applications than that herein described.

The aim of the invention is to provide a very simple and effective stop mechanism which is automatic in operation and which will stop the shaft after it has been rotated through a predetermined angle and will permit further rotation of the shaft in the same direction after it has been thus stopped.

Other objects will be in part obvious and in part pointed out more in. detail hereinafter.

The invention accordingly consists in the features of construction, combination of elements, and arrangement of parts which will be exemplified in the construction hereafter set forth and the scope of the application of which will be indicated in the appended claims.

In the accompanying drawing:

Figure 1 is a top plan view showing so much of the recording mechanism disclosed in said McMullen patent as is necessary to illustrate an application of the present invention;

Fig. 2 is a left hand end view of what is shown in Fig. 1, the stop means being shown in operative position;

Fig. 3 is a detailed view showing the operating pawl with which the stop member is associated; and

Fig. 4 is a View similar to Fig. 2 with parts omitted and with the stop means shown in inoperative position.

Referring to the drawing in detail, the numeral ID designates a frame within which is mounted a counter having a plurality of type wheels ll. Journaled in the frame is a rock shaft l2 to which is fixed a platen i3 adapted to be moved into and out of engagement with the type wheels i l. The numeral [4 designates an operating shaft having a crank or handle I 5 on one end thereof. On the other end of the shaft is fixed a cam l6 for operating the platen l3. The rock shaft l2 has fixed to it an arm I! carrying a roller 18 which connected at its respective ends to the frame and the arm.

Referring now to the stop means to which the present invention is directed, the same includes a stop member 3t cooperating with a stop 3| fixed to the shaft l4, and a stop operating pawl 32 corides on the periphery of the cam It. The platen is urged towards the type wheels by a spring [9 operating with a single ratchet tooth 33 carried by the shaft M; The stop 3| is in the form of a lug extending radially from a collar 34 fixed. to the shaft, this collar, in the present instance, constituting a hub of the cam it. The ratchet tooth 33 is provided on this collar with its radially extending fac generally in the same plane as that face of the lug 3| with which the member 30 is adapted to engage.

The stop member 30 is pivoted on the rock shaft l2 and it has two arms or fingers 36 and 3'! which straddle the collar 34. The arm 36 is adapted to rest upon the periphery of the collar 34 and to lie in the path of movement of the lug 3! when the stop member is in the operative position shown in Fig. 2. The arm 31 is adapted to engage the periphery of the collar when the stop member is thrown to the inoperative position shown in Fig. 4. For the purpose of resiliently and releasably holding the stop member in each of its extreme positions, the rear end thereof has an angular or wedge portion 38 with which cooperates the wedge-shaped end of a spring urged holding member 39 pivoted on a pin 40 carried by the frame.

The stop operating pawl 32 is also pivoted on the rock shaft l2, but in this case there is a loose connection between the pawl and the rock shaft in order to permit the pawl to be moved bodily endwise a limited amount. To this end, the opening 4! in the pawl which receives the shaft i2 is somewhat elongated, as most clearly shown in Fig. 3. The free end of the pawl 32 has a tooth 42 adapted to cooperate with the radial face of the ratchet tooth 33. The free end of the pawl is urged against the collar 34 and the pawl is urged endwise into the position shown in Fig. 3 bv a spring 53 connected at one end to the pawl 32 and at its other end to the holdmember 39. Projecting from the pawl 32 and located between the ends thereof is a pin 44 engaging in a cam opening 45 in the stop member 30. This opening has a cam edge 46 angularly disposed with respect to the length of the stop member 30.

Also, if desired. means may be provided for preventing unlimited reverse rotation of the shaft It. In the present instance, this means comprises a no-reverse pawl 50 loosely pivoted on the rock shaft [2 alongside of the stop operating pawl 32, and a multi-toothed ratchet 5 I, the teeth of which are also formed in the collar 34 along one side of the single toothed ratchet 33. The no-reverse pawl 50 is similar to the pawl 32 and is mounted in like manner on the rock shaft 12. It, too, is urged against the collar and in an endwise direction by the spring 43.

The operation of the stop means is briefly as follows: Assuming that the shaft has been turned counterclockwise to the position shown in Figs. 2 and 3, it will be observed that the shaft is stopped in that position by the engagement of the lug 3| against the end of the arm 35 of the stop member and that the tooth 42 of the pawl 32 is engaged with the single ratchet tooth 33 carried by the shaft. If it is desired to now rotate the shaft in a counterclockwise direction, the handle is first turned slightly in the reverse direction (that is, clockwise), thereby causing the ratchet tooth 33 to pull the operating pawl 32 to the right from the position shown in Fig. 3 to that shown in Fig. 4 with the result that the pin 44 engages and rides along the cam edge 46 thereby swinging the stop member from the operative position shown in Fig. 2 to the inoperative position shown in Fig. 4. The operating pawl and the no-reverse pawl move together during the operation just described. The shaft may now be turned counterclockwise from the position shown in Fig. 4 since the lug3l will clear the arm 3%. .When the lug 3! engages the arm 31, it moves the stop member back to the operative position shown in Fig. 2 with the result that when the shaft has made a complete revolution, it is again stopped in the position shown in the latter figure.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as amatter of language, might be said to fall therebetween.

I claim as my invention:

1. In combination, a shaft having an operative rotary movement in one direction, means for stopping said shaft when it has been rotated through a predetermined angle and including a stop carried by the shaft and a pivoted stop memher having a shoulder adapted to be moved into and out of the path of movement of said stop, and means for moving said stop member into inoperative position upon a slight reverse rotation of the shaft including a ratchet tooth carried by the shaft, a pivoted and bodily movable pawl having a tooth engageable with said ratchet tooth during such reverse rotation of the shaft,

and an operative connection between said pawl and stop member.

2. In combination, a shaft having an operative rotary movement in one direction and provided with a stop and a ratchet toothlocated at the side of the stop, a pivoted stop member having an operative and inoperative position and having an abutment disposed in the path of movement of said stop when said member is in operative position, a pivoted stop operating pawl mounted for limited endwise movement and having a tooth adapted to engage said ratchet tooth when said stop is engaged with said abutment, a spring normally urging said pawl endwise in the direction in which the tooth thereof faces, and an operative connection between said pawl and stop member whereby when said shaft is rotated through a slight angle in a reverse direction from a stopped position said pawl is moved endwise and said connection causes said stop member to move to inoperative position.

3. In combination, a shaft having an operative rotary movement in one direction and provided with a stop and a ratchet tooth located adjacent the stop, a pivoted stop member having a pair of arms straddling said shaft, one of said arms being disposed in the path of movement of said stop when said member is in operative position, and the other arm engaging said shaft and being in the path of movement of said stop when said member is in inoperative position, a pivoted stop operating pawl mounted for limited endwise movement and having a tooth adapted to engage said ratchet tooth when said stop is engaged by said first mentioned arm, a spring normally urging said pawl endwise in the direction in which the tooth thereof faces, and an operative connection between said pawl and stop member whereby, when said shaft is rotated through a slight angle in a reverse direction from a stopped position, said pawl is moved endwise and said connection causes said stop member to move to inoperative position.

4. In combination, a shaft having an operative rotary movement in one direction and provided with a stop and a ratchet tooth adjacent the stop, a pivoted stop member having an operative and an inoperative position and having an abutment disposed in the path of movement of said stop when said member is in operative position, a pivotedstop operating pawl mounted for endwise movement and having a tooth adapted to engage said ratchet tooth when said stop is engaged with said abutment, a spring normally urging said pawl endwise in the direction in which the tooth thereof faces, and an operative connection between said pawl and stop member and comprising a pin carried by said pawl and a cam edge on said member adapted to be engaged by said pin when said pawl is moved endwise upon a slight reverse rotation of said shaft from stopped position whereby said stop member is moved into inoperative position.

5. In combination, a shaft having an operative rotary movement in one direction and provided with a stop, a single toothed ratchet and a multitoothed ratchet, a rod parallel to said shaft, a stop member pivoted on said rod and having an operative and an inoperative position and having an abutment disposed in the path of said stop when said member is in inoperative position, a stop operating pawl carried by said rod for pivotal 'movement and a limited endwise movement and 

